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When someone smiles at you, how can you tell whether that smile is genuine or fake and why would you want to know? According to Professor of visual computing at the University of Bradford, Hassan Ugail, it’s all in the eyes! Humans are notoriously bad at picking up fake smiles, because we tend to focus our vision on the upturned corners of the mouth. Focus on specific movement of the eyes and the dynamic progression of a smile, however, and that’s when a genuine smile is evident. Hassan explains how computers are over 90% successful at being able to detect fake smiles, and examines the purposes to which this facial recognition technology may be applied in our daily lives. Gareth Mitchell finds out more. First broadcast on Â鶹Éç Inside Science, 8 August 2019.